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SRI/USEPA-GHG-VR-27 September 2003 Table 3-4. Variability Observed in Operating Conditions Maximum Allowable Variation Run 1 Run 2 Run 3 Run 4 Run 5 Run 6 Run 7 Run 8 Run 9 Run 10 Run 11 Run 12 Run 13 Run 14 Run 15 Run 16 Run 17 Run 18 Maximum Observed Variationa in Measured Parameters Power Power Factor Fuel Flow Inlet Air Inlet Air Output (%) (%) Rate (%) Press. (%) Temp. (oF) ±2 ±2 ±2 ±0.5 ±4 0.1 0.0 0.6 0.0 0.4 0.1 0.0 0.6 0.0 0.4 0.1 0.0 0.7 0.0 0.2 0.1 0.0 0.7 0.0 0.2 0.1 0.0 0.7 0.0 0.4 0.1 0.0 0.6 0.0 0.1 0.1 0.0 0.7 0.0 0.5 0.1 0.0 0.8 0.0 1.1 0.1 0.0 0.7 0.0 1.4 0.1 0.0 0.7 0.0 0.8 0.1 0.0 1.1 0.0 0.2 0.2 0.0 1.1 0.0 0.9 0.1 0.0 0.9 0.0 1.9 0.1 0.0 0.8 0.0 2.1 0.2 0.0 0.9 0.0 1.2 0.2 0.0 1.0 0.1 3.0 0.2 0.0 1.1 0.0 0.9 0.2 0.0 1.5 0.0 1.1 a Maximum (Average of Test Run – Observed Value) / Average of Test Run * 100 3.2.2.2. Ambient Measurements Ambient temperature, relative humidity, and barometric pressure at the site were monitored throughout the extended verification period and the controlled tests. The instrumentation used is identified in Table 3-2 along with instrument ranges, data quality goals, and data quality achieved. All three sensors were factory-calibrated using reference materials traceable to NIST standards. The pressure sensor was calibrated prior to the verification testing, confirming the ± 0.1 percent accuracy. The pre-test temperature and relative humidity sensor calibration had expired two months prior to the testing, so a post-test calibration of the instrument was also performed. Both pre- and post-test factory calibrations verified that the ± 2 °F accuracy goal for temperature and ± 2 percent accuracy goal for relative humidity were met. 3.2.2.3. Fuel Flow Rate The Test Plan specified the use of an integral orifice meter (Rosemount Model 3095) to measure the flow of natural gas supplied to the CHP system. The two major components of the integral orifice meter (the differential-pressure sensor and the orifice plate bore) were factory-calibrated prior to installation in the field. Calibration records were reviewed to ensure that the ± 1.0-percent instrument accuracy goal was satisfied. QC checks (sensor diagnostics) listed in Table 3-4 were conducted to ensure proper function in the field. Sensor diagnostic checks consisted of zero-flow verification by isolating the meter from the flow, equalizing the pressure across the differential pressure (DP) sensors, and reading the pressure differential and flow rate. The sensor output must read zero flow during these checks. Transmitter analog output 3-8PDF Image | Environmental Technology Verification Report
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